pwm_control.c

来自「NXP2103 PWM控制程序」· C语言 代码 · 共 127 行

/*
*******************************************************************************
*                     (c) Copyright 2008 
*                             All Rights Reserved
*
*                                   Version V1.00
*
* Product Number: 
* Compiler Tool : 
* MCU		: 
* File 		: PWM_Control.c
* By   		: Tom.Yin
* Date 		: 
*******************************************************************************
*/

/*
*******************************************************************************
* 			     INCLUDE FILE
*******************************************************************************
*/
#include "Include.h"


/*
*******************************************************************************
*				      GLOBAL 
*******************************************************************************
*/

/*
*******************************************************************************
* 		             LOCAL DEFINE
*******************************************************************************
*/
static int PWM_Frequence;		

/*
*******************************************************************************
* 		             LOCAL PARAMETER
*******************************************************************************
*/

/*
*******************************************************************************
* 		            FUNCTION DECLARE
*******************************************************************************
*/
			
			
				
/*
*******************************************************************************
*                             PWM_IO_Config
* Description: PWM IO interface config
*
* Arguments  : None
*
* Returns    : None
* 
* Programers : Tom.Yin
*
* Date	     : 
*
*******************************************************************************
*/
void PWM_IO_Config(void)
{
	PINSEL1 |= 2 << 28;															//MAT3.3
}


/*
*******************************************************************************
*                             Init_PWM
* Description: Init PWM
*
* Arguments  : frequence---------------------------PWM frequence
*              default_duty------------------------default PWM duty, by RESOLUTION
*
* Returns    : None
* 
* Programers : Tom.Yin
*
* Date	     : 
*
*******************************************************************************
*/
void Init_PWM(unsigned int frequence, unsigned int default_duty)				//Resolution 1/RESOLUTION
{
	PWM_IO_Config();
	
	PWM_Frequence	= frequence;

	T3PR			= 0;														//PWM counter prescale
	T3MCR			= 0X02;														//match control, select cycle reg
	T3EMR			= 0; 														//extern match event 
	T3PWMCON		= 1 << 3;													//PWM output channel select

	T3MR0			= FPCLK / PWM_Frequence;									//Set PWM Cycle
	T3MR3			= T3MR0 + 1 - T3MR0 * default_duty / RESOLUTION;			//Set PWM duty
	
	T3TCR			= 0X03;														//start PWM
	T3TCR			= 0X01;
}

/*
*******************************************************************************
*                             Set_PWM
* Description: Init PWM
*
* Arguments  : duty---------------------------Set PWM Duty
*
* Returns    : None
* 
* Programers : Tom.Yin
*
* Date	     : 
*
*******************************************************************************
*/
void Set_PWM(unsigned int duty)													//Resolution 1/1000 duty
{
	T3MR3		= (FPCLK / PWM_Frequence) + 1 - (FPCLK / PWM_Frequence) * duty / RESOLUTION;
}